Spray dryer

Abstract

The spray dryer comprises a preheating device, a drying device and a separating device which are communicated with one another, the preheating device comprises a machine shell, a communicating pipe, a heat exchange pipeline and a temperature adjusting device, and the heat exchange pipeline is provided with a first breather pipe, an air outlet pipe and a second breather pipe. The temperature adjusting device comprises a temperature sensor, a gas tank and a first control valve, wherein hot gas reaching the temperature value needed by preheating is stored in the gas tank. When the preheating device preheats feed liquid, tail gas with heat in the separation device is introduced into the heat exchange pipeline through the first breather pipe, the temperature sensor detects the temperature of the heat exchange pipeline, converts the obtained temperature value into an electric signal and transmits the electric signal to the first control valve, and when the temperature of the heat exchange pipeline does not reach the temperature needed by preheating, the first control valve is started. The first control valve controls the gas tank to be communicated with the second ventilation pipe, so that hot gas with the temperature value reaching the standard in the gas tank is introduced into the heat exchange pipeline, the temperature value in the heat exchange pipeline reaches the temperature value required by preheating, and the preheating efficiency of the spray dryer on feed liquid is improved.

Description

Technical Field

[0001] The utility model relates to the field of dryers, in particular to a spray dryer. Background Art

[0002] Spray dryers are usually used as mechanical equipment that uses heat energy to reduce the moisture content of materials and are used to dry objects. Spray dryers vaporize and release moisture in materials by heating to obtain solid powdered materials with a specified moisture content. Spray dryers mainly include a preheating device, a drying device, and a separation device. When drying the liquid, the liquid is first preheated by the preheating device, then atomized and dried by the drying device, and finally separated from other gases by the separation device, and the particles are output. The setting of the preheating device improves the drying rate of the liquid.

[0003] The existing preheating device includes a connecting pipe and a plurality of heat exchange pipes arranged on the connecting pipe. The heat exchange pipe is sleeved on the connecting pipe. During preheating, the feed liquid is introduced into the connecting pipe, and hot gas is introduced into the heat exchange pipe to preheat the feed liquid. However, the hot gas introduced into the existing heat exchange pipe is the tail gas with heat remaining in the separation device, thereby improving the energy saving of the preheating device. However, the temperature of the tail gas with heat in the separation device is relatively low, which cannot meet the requirements of the feed liquid preheating temperature in the connecting pipe, so that the feed liquid preheating efficiency is reduced. Utility Model Content

[0004] Based on the technical problems existing in the above-mentioned prior art, the utility model provides a spray dryer, which can improve the preheating efficiency of the spray dryer on the feed liquid.

[0005] The utility model solves the technical problem by adopting the following technical solution: providing a spray dryer, comprising a preheating device, a drying device and a separation device, wherein the preheating device is connected to the drying device and the separation device, the preheating device comprises a casing, a connecting pipe, a heat exchange pipe and a temperature regulating device arranged in the casing, the heat exchange pipe is provided with a vent pipe 1 connected to the separation device and an air outlet pipe and a vent pipe 2 connected to the heat exchange pipe, the temperature regulating device comprises a temperature sensor arranged in the casing, a gas tank connected to the vent pipe 2 and a control valve 1 arranged on the gas tank, the control valve 1 is used to control the connection between the gas tank and the vent pipe 2, and the control valve 1 is electrically connected to the temperature sensor.

[0006] Furthermore, the drying device includes a drying main unit and a first air inlet duct connected to the drying main unit, the first air inlet duct is connected to the gas tank, and the preheating device also includes a second control valve arranged on the first air inlet duct, and the second control valve is used to control the connection between the first air inlet duct and the gas tank.

[0007] Furthermore, the connecting pipe is provided with a liquid feed pipeline, and the drying device further comprises an atomizer arranged on the drying host, and the atomizer is connected to an end of the liquid feed pipeline away from the connecting pipe.

[0008] Furthermore, the drying device also includes a first discharge pipe arranged on the drying main unit, and the first discharge pipe is connected to the drying main unit.

[0009] Furthermore, the heat exchange pipe includes a first tube body and a second tube body connected to each other, the first tube body and the second tube body are perpendicular to each other, the first tube body and the connecting tube are parallel to each other, and the second tube body and the first tube body are spaced apart.

[0010] Furthermore, the separation device includes a cyclone separator connected to the dryer, a bag filter, and a first air pipeline connecting the cyclone separator and the bag filter, and the ventilation pipe 1 is connected to the bag filter.

[0011] The beneficial effects of the utility model are as follows: a spray dryer is provided, comprising a preheating device, a drying device and a separation device, wherein the preheating device is connected to the drying device and the separation device, the preheating device comprises a casing, a connecting pipe, a heat exchange pipe and a temperature regulating device arranged in the casing, the heat exchange pipe is provided with a vent pipe 1 connected to the separation device and an outlet pipe and a vent pipe 2 connected to the heat exchange pipe, the temperature regulating device comprises a temperature sensor arranged on the heat exchange pipe, a gas tank connected to the vent pipe 2 and a control valve 1 arranged on the vent pipe 2, the gas tank stores hot gas reaching a temperature value required for preheating, the control valve 1 is used to control the connection between the gas tank and the vent pipe 2, and the control valve 1 is electrically connected to the temperature sensor. When the preheating device preheats the liquid feed, the hot exhaust gas in the separation device is passed into the heat exchange pipe through the ventilation pipe 1, and the temperature sensor detects the temperature of the heat exchange pipe. The temperature sensor converts the acquired temperature value into an electrical signal and transmits it to the control valve 1. When the temperature of the heat exchange pipe does not reach the temperature required for preheating, the control valve 1 controls the gas tank and the ventilation pipe 2 to be connected, so that the hot gas with a temperature value that meets the standard in the gas tank is passed into the heat exchange pipe, so that the temperature value in the heat exchange pipe reaches the temperature value required for preheating, thereby improving the preheating efficiency of the spray dryer for the liquid feed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] In the figure: Figure 1 An overall structural diagram of a spray dryer provided by the utility model;

[0014] Figure 2 for Figure 1 The three-dimensional structural diagram of the preheating device is shown (the first air inlet duct is not hidden).

[0015] Explanation of the reference numerals: 100, spray dryer; 10, preheating device; 11, connecting pipe; 111, feed-liquid pipeline; 112, liquid inlet pipeline; 12, heat exchange pipeline; 121, ventilation pipe one; 122, air outlet pipe; 123, ventilation pipe two; 124, first tube body; 125, second tube body; 13, temperature regulating device; 131, temperature sensor; 132, gas tank; 133, control valve one; 134, control valve two; 14, casing; 20, drying device; 21, drying main unit; 22, first air inlet pipeline; 23, atomizer; 24, first discharge pipeline; 30, separation device; 31, cyclone separator; 32, bag filter; 33, first gas pipeline; 34, second discharge pipeline; 35, third discharge pipeline. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the utility model in a schematic manner, so it only shows the structure related to the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0017] Please refer to Figure 1-2 The spray dryer 100 includes a preheating device 10, a drying device 20 and a separation device 30, and the preheating device 10, the drying device 20 and the separation device 30 are interconnected.

[0018] The preheating device 10 includes a casing 14, a connecting pipe 11, a heat exchange pipe 12 and a temperature regulating device 13 arranged in the casing 14. Specifically, the connecting pipe 11 is provided with a feed liquid pipe 111 connected to the drying device 20 and a liquid inlet pipe 112 connected to the connecting pipe 11. The liquid inlet pipe 112 is located on the left side of the casing 14, and the feed liquid pipe 111 is located on the right side of the casing 14.

[0019] The heat exchange pipe 12 is provided with a vent pipe 1 121 connected to the separation device 30, and an outlet pipe 122 and a vent pipe 2 123 connected to the heat exchange pipe 12. Specifically, the vent pipe 1 121 is located at the bottom end of the casing 14, and the outlet pipe 122 is located at the top end of the casing 14. The exhaust gas with heat in the separation device 30 flows along the vent pipe 1 121, the heat exchange pipe 12 and the outlet pipe 122 in sequence.

[0020] The temperature regulating device 13 includes a temperature sensor 131 disposed on the heat exchange pipe 12, a gas tank 132 connected to the second ventilation pipe 123, a control valve 133 and a control valve 2 134. The gas tank 132 stores hot gas reaching the temperature value required for preheating. The control valve 133 is disposed on the second ventilation pipe 132. The control valve 133 is used to control the connection between the gas tank 132 and the second ventilation pipe 123. The control valve 133 is electrically connected to the temperature sensor 131. Specifically, the temperature value of the hot gas in the gas tank 132 is set to 80 degrees.

[0021] The heat exchange pipe 12 includes a first tube body 124 and a second tube body 125 that are interconnected. Specifically, the first tube body 124 and the second tube body 125 are each provided with a plurality, the first tube body 124 and the second tube body 125 are perpendicular to each other, the first tube body 124 and the connecting pipe 11 are parallel to each other, and the second tube body 125 and the first tube body 124 are arranged at intervals.

[0022] The drying device 20 includes a drying main unit 21, a first air inlet duct 22 connected to the drying main unit 21, an atomizer 23 located at the top of the drying main unit 21, and a first discharge duct 24 connected to the bottom of the drying main unit 21. Specifically, the drying main unit 21 is composed of a column and a cone. One end of the first discharge duct 24 is connected to the bottom of the cone, and the other end of the first discharge duct 24 is connected to the separation device 30, which is suitable for outputting the dried product; the first air inlet duct 22 is located on one side of the column part, and the two ends of the first air inlet duct 22 are connected to the gas tank and the drying main unit 21 respectively. Specifically, the second control valve 134 is used to control the connection between the first air inlet duct 22 and the gas tank 132, and the second control valve 134 is arranged on the first air inlet duct 22. It is used to transport hot air of about 80 degrees Celsius into the drying main unit 21, and perform heat exchange with the atomized droplets inside the drying main unit 21, so that the atomized droplets evaporate quickly to form particles; the atomizer 23 is arranged on the top of the drying main unit 21, and the atomizer 23 is connected to the end of the feed liquid pipeline 111 away from the connecting pipe 11, and the feed liquid pipeline 111 is suitable for inputting the preheated feed liquid output by the feed liquid preheating device 10, and the preheated feed liquid is transported through the feed liquid pipeline 111 to the atomizer 23 for atomization, thereby increasing the surface area of ​​the feed liquid, and after the feed liquid is preheated, the drying rate is accelerated, and the working efficiency of the drying main unit 21 is improved.

[0023] The separation device 30 includes a cyclone separator 31 connected to the other end of the first discharge pipe 24, a bag filter 32, a first air supply pipe 33 connecting the cyclone separator 31 and the bag filter 32, a second discharge pipe 34 arranged at the bottom of the cyclone separator 31, and a third discharge pipe 35 arranged at the bottom of the cyclone separator 31.

[0024] Among them, the cyclone separator 31 consists of two parts, a column and a cone. The cyclone separator 31 is connected to the drying main unit 21 through a first discharge pipe 24. One end of the first discharge pipe 24 is connected to the bottom of the drying main unit 21, and the other end is connected to the bottom side wall of the cyclone separator 31. The product dried in the drying main unit 21 enters the cyclone separator 31 through the first discharge pipe 24 to perform the first separation of the solid-gas mixture; the second discharge pipe 34 is located at the bottom of the cone of the cyclone separator 31, and the particles dried in the cyclone separator 31 are output as products through the second discharge pipe 34. One end of the first gas pipeline 33 is connected to the bottom of the cyclone separator 31, and the other end of the first gas pipeline 33 is connected to the top side wall of the bag filter 32. The solid and gas mixture containing a small amount of particles is output from the first gas pipeline 33 at the top of the cyclone separator 31, and then enters the bag filter 32 for secondary filtration; the third discharge pipeline 35 is located at the bottom of the bag filter 32, and the particles dried in the bag filter 32 are output again through the third discharge pipeline 35; one end of the ventilation pipe 36 is connected to the top of the bag filter 32, and the other end of the ventilation pipe 36 is connected to the heat exchange pipe 12 in the preheating device 10. The ventilation pipe 36 can input the exhaust gas with heat finally output in the bag filter 32 into the heat exchange pipe 12, which is used to preheat the liquid to be dried in the connecting pipe 11.

[0025] Beneficial effect: When the preheating device 10 preheats the liquid feed, the hot exhaust gas in the separation device 30 is passed into the heat exchange pipe 12 through the ventilation pipe 121, and the temperature sensor 131 detects the temperature of the heat exchange pipe 12. The temperature sensor 131 converts the acquired temperature value into an electrical signal and transmits it to the control valve 133. When the temperature of the heat exchange pipe 12 does not reach the temperature required for preheating, the control valve 133 controls the gas tank 132 and the ventilation pipe 2 123 to be connected, so that the hot gas with a temperature value that meets the standard in the gas tank 132 is passed into the heat exchange pipe 12, so that the temperature value in the heat exchange pipe 12 reaches the temperature value required for preheating, thereby improving the preheating efficiency of the spray dryer 100 for the liquid feed.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] The above is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A spray dryer, characterized in that: The invention comprises a preheating device (10), a drying device (20) and a separation device (30), wherein the preheating device (10), the drying device (20) and the separation device (30) are connected to each other, the preheating device (10) comprises a casing, a connecting pipe (11) arranged in the casing, a heat exchange pipe (12) and a temperature regulating device (13), the heat exchange pipe (12) is provided with a ventilation pipe 1 (121) connected to the separation device (30), an air outlet pipe (122) connected to the heat exchange pipe (12) and a ventilation pipe 2 (123). 23), the temperature regulating device (13) comprises a temperature sensor (131) arranged on the heat exchange pipe (12), a gas tank (132) connected to the second ventilation pipe (123), and a control valve (133) arranged on the second ventilation pipe (123), the gas tank (132) stores hot gas reaching the temperature value required for preheating, the control valve (133) is used to control the connection between the gas tank (132) and the second ventilation pipe (123), and the control valve (133) and the temperature sensor (131) are electrically connected.

2. The spray dryer according to claim 1, characterized in that: The drying device (20) comprises a drying main unit (21) and a first air inlet duct (22) connected to the drying main unit (21), the first air inlet duct (22) being connected to the gas tank (132), and the preheating device (10) further comprises a second control valve (134) arranged on the first air inlet duct (22), the second control valve (134) being used to control the connection between the first air inlet duct (22) and the gas tank (132).

3. The spray dryer according to claim 2, characterized in that: The connecting pipe (11) is provided with a liquid feed pipeline (111), and the drying device (20) further comprises an atomizer (23) arranged on the drying main unit (21), and the atomizer (23) is connected to an end of the liquid feed pipeline (111) away from the connecting pipe (11).

4. The spray dryer according to claim 2, characterized in that: The drying device (20) further comprises a first discharge pipe (24) arranged on the drying main unit (21), wherein the first discharge pipe (24) is in communication with the drying main unit (21).

5. The spray dryer (100) according to claim 1, characterized in that: The heat exchange pipe (12) comprises a first tube body (124) and a second tube body (125) which are interconnected, the first tube body (124) and the second tube body (125) are perpendicular to each other, the first tube body (124) and the connecting pipe (11) are parallel to each other, and the second tube body (125) and the first tube body (124) are arranged at intervals.

6. The spray dryer according to claim 1, characterized in that: The separation device (30) comprises a cyclone separator (31) connected to the dryer, a bag filter (32) and a first air supply pipeline (33) connecting the cyclone separator (31) and the bag filter (32), and the ventilation pipe (121) is connected to the bag filter (32).

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